blob: 4ecdaafda0aee16682674abf48b40042214217bd
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Mini cp implementation for busybox |
4 | * |
5 | * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu> |
6 | * SELinux support by Yuichi Nakamura <ynakam@hitachisoft.jp> |
7 | * |
8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
9 | */ |
10 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) |
11 | * |
12 | * Size reduction. |
13 | */ |
14 | //config:config CP |
15 | //config: bool "cp" |
16 | //config: default y |
17 | //config: help |
18 | //config: cp is used to copy files and directories. |
19 | //config: |
20 | //config:config FEATURE_CP_LONG_OPTIONS |
21 | //config: bool "Enable long options for cp" |
22 | //config: default y |
23 | //config: depends on CP && LONG_OPTS |
24 | //config: help |
25 | //config: Enable long options for cp. |
26 | //config: Also add support for --parents option. |
27 | |
28 | //applet:IF_CP(APPLET_NOEXEC(cp, cp, BB_DIR_BIN, BB_SUID_DROP, cp)) |
29 | |
30 | //kbuild:lib-$(CONFIG_CP) += cp.o |
31 | |
32 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/cp.html */ |
33 | |
34 | //usage:#define cp_trivial_usage |
35 | //usage: "[OPTIONS] SOURCE... DEST" |
36 | //usage:#define cp_full_usage "\n\n" |
37 | //usage: "Copy SOURCE(s) to DEST\n" |
38 | //usage: "\n -a Same as -dpR" |
39 | //usage: IF_SELINUX( |
40 | //usage: "\n -c Preserve security context" |
41 | //usage: ) |
42 | //usage: "\n -R,-r Recurse" |
43 | //usage: "\n -d,-P Preserve symlinks (default if -R)" |
44 | //usage: "\n -L Follow all symlinks" |
45 | //usage: "\n -H Follow symlinks on command line" |
46 | //usage: "\n -p Preserve file attributes if possible" |
47 | //usage: "\n -f Overwrite" |
48 | //usage: "\n -i Prompt before overwrite" |
49 | //usage: "\n -l,-s Create (sym)links" |
50 | //usage: "\n -u Copy only newer files" |
51 | |
52 | #include "libbb.h" |
53 | #include "libcoreutils/coreutils.h" |
54 | |
55 | /* This is a NOEXEC applet. Be very careful! */ |
56 | |
57 | int cp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
58 | int cp_main(int argc, char **argv) |
59 | { |
60 | struct stat source_stat; |
61 | struct stat dest_stat; |
62 | const char *last; |
63 | const char *dest; |
64 | int s_flags; |
65 | int d_flags; |
66 | int flags; |
67 | int status; |
68 | enum { |
69 | FILEUTILS_CP_OPTNUM = sizeof(FILEUTILS_CP_OPTSTR)-1, |
70 | #if ENABLE_FEATURE_CP_LONG_OPTIONS |
71 | /*OPT_rmdest = FILEUTILS_RMDEST = 1 << FILEUTILS_CP_OPTNUM */ |
72 | OPT_parents = 1 << (FILEUTILS_CP_OPTNUM+1), |
73 | #endif |
74 | }; |
75 | |
76 | // Need at least two arguments |
77 | // Soft- and hardlinking doesn't mix |
78 | // -P and -d are the same (-P is POSIX, -d is GNU) |
79 | // -r and -R are the same |
80 | // -R (and therefore -r) turns on -d (coreutils does this) |
81 | // -a = -pdR |
82 | opt_complementary = "-2:l--s:s--l:Pd:rRd:Rd:apdR"; |
83 | #if ENABLE_FEATURE_CP_LONG_OPTIONS |
84 | applet_long_options = |
85 | "archive\0" No_argument "a" |
86 | "force\0" No_argument "f" |
87 | "interactive\0" No_argument "i" |
88 | "link\0" No_argument "l" |
89 | "dereference\0" No_argument "L" |
90 | "no-dereference\0" No_argument "P" |
91 | "recursive\0" No_argument "R" |
92 | "symbolic-link\0" No_argument "s" |
93 | "verbose\0" No_argument "v" |
94 | "update\0" No_argument "u" |
95 | "remove-destination\0" No_argument "\xff" |
96 | "parents\0" No_argument "\xfe" |
97 | ; |
98 | #endif |
99 | flags = getopt32(argv, FILEUTILS_CP_OPTSTR); |
100 | /* Options of cp from GNU coreutils 6.10: |
101 | * -a, --archive |
102 | * -f, --force |
103 | * -i, --interactive |
104 | * -l, --link |
105 | * -L, --dereference |
106 | * -P, --no-dereference |
107 | * -R, -r, --recursive |
108 | * -s, --symbolic-link |
109 | * -v, --verbose |
110 | * -H follow command-line symbolic links in SOURCE |
111 | * -d same as --no-dereference --preserve=links |
112 | * -p same as --preserve=mode,ownership,timestamps |
113 | * -c same as --preserve=context |
114 | * -u, --update |
115 | * copy only when the SOURCE file is newer than the destination |
116 | * file or when the destination file is missing |
117 | * --remove-destination |
118 | * remove each existing destination file before attempting to open |
119 | * --parents |
120 | * use full source file name under DIRECTORY |
121 | * NOT SUPPORTED IN BBOX: |
122 | * --backup[=CONTROL] |
123 | * make a backup of each existing destination file |
124 | * -b like --backup but does not accept an argument |
125 | * --copy-contents |
126 | * copy contents of special files when recursive |
127 | * --preserve[=ATTR_LIST] |
128 | * preserve attributes (default: mode,ownership,timestamps), |
129 | * if possible additional attributes: security context,links,all |
130 | * --no-preserve=ATTR_LIST |
131 | * --sparse=WHEN |
132 | * control creation of sparse files |
133 | * --strip-trailing-slashes |
134 | * remove any trailing slashes from each SOURCE argument |
135 | * -S, --suffix=SUFFIX |
136 | * override the usual backup suffix |
137 | * -t, --target-directory=DIRECTORY |
138 | * copy all SOURCE arguments into DIRECTORY |
139 | * -T, --no-target-directory |
140 | * treat DEST as a normal file |
141 | * -x, --one-file-system |
142 | * stay on this file system |
143 | * -Z, --context=CONTEXT |
144 | * (SELinux) set SELinux security context of copy to CONTEXT |
145 | */ |
146 | argc -= optind; |
147 | argv += optind; |
148 | /* Reverse this bit. If there is -d, bit is not set: */ |
149 | flags ^= FILEUTILS_DEREFERENCE; |
150 | /* coreutils 6.9 compat: |
151 | * by default, "cp" derefs symlinks (creates regular dest files), |
152 | * but "cp -R" does not. We switch off deref if -r or -R (see above). |
153 | * However, "cp -RL" must still deref symlinks: */ |
154 | if (flags & FILEUTILS_DEREF_SOFTLINK) /* -L */ |
155 | flags |= FILEUTILS_DEREFERENCE; |
156 | |
157 | #if ENABLE_SELINUX |
158 | if (flags & FILEUTILS_PRESERVE_SECURITY_CONTEXT) { |
159 | selinux_or_die(); |
160 | } |
161 | #endif |
162 | |
163 | status = EXIT_SUCCESS; |
164 | last = argv[argc - 1]; |
165 | /* If there are only two arguments and... */ |
166 | if (argc == 2) { |
167 | s_flags = cp_mv_stat2(*argv, &source_stat, |
168 | (flags & FILEUTILS_DEREFERENCE) ? stat : lstat); |
169 | if (s_flags < 0) |
170 | return EXIT_FAILURE; |
171 | d_flags = cp_mv_stat(last, &dest_stat); |
172 | if (d_flags < 0) |
173 | return EXIT_FAILURE; |
174 | |
175 | #if ENABLE_FEATURE_CP_LONG_OPTIONS |
176 | //bb_error_msg("flags:%x FILEUTILS_RMDEST:%x OPT_parents:%x", |
177 | // flags, FILEUTILS_RMDEST, OPT_parents); |
178 | if (flags & OPT_parents) { |
179 | if (!(d_flags & 2)) { |
180 | bb_error_msg_and_die("with --parents, the destination must be a directory"); |
181 | } |
182 | } |
183 | if (flags & FILEUTILS_RMDEST) { |
184 | flags |= FILEUTILS_FORCE; |
185 | } |
186 | #endif |
187 | |
188 | /* ...if neither is a directory... */ |
189 | if (!((s_flags | d_flags) & 2) |
190 | /* ...or: recursing, the 1st is a directory, and the 2nd doesn't exist... */ |
191 | || ((flags & FILEUTILS_RECUR) && (s_flags & 2) && !d_flags) |
192 | ) { |
193 | /* Do a simple copy */ |
194 | dest = last; |
195 | goto DO_COPY; /* NB: argc==2 -> *++argv==last */ |
196 | } |
197 | } |
198 | |
199 | while (1) { |
200 | #if ENABLE_FEATURE_CP_LONG_OPTIONS |
201 | if (flags & OPT_parents) { |
202 | char *dest_dup; |
203 | char *dest_dir; |
204 | dest = concat_path_file(last, *argv); |
205 | dest_dup = xstrdup(dest); |
206 | dest_dir = dirname(dest_dup); |
207 | if (bb_make_directory(dest_dir, -1, FILEUTILS_RECUR)) { |
208 | return EXIT_FAILURE; |
209 | } |
210 | free(dest_dup); |
211 | goto DO_COPY; |
212 | } |
213 | #endif |
214 | dest = concat_path_file(last, bb_get_last_path_component_strip(*argv)); |
215 | DO_COPY: |
216 | if (copy_file(*argv, dest, flags) < 0) { |
217 | status = EXIT_FAILURE; |
218 | } |
219 | if (*++argv == last) { |
220 | /* possibly leaking dest... */ |
221 | break; |
222 | } |
223 | /* don't move up: dest may be == last and not malloced! */ |
224 | free((void*)dest); |
225 | } |
226 | |
227 | /* Exit. We are NOEXEC, not NOFORK. We do exit at the end of main() */ |
228 | return status; |
229 | } |
230 |